a small fart often not thought to be worth mentionning, but can sometimes be followed through, resulting excremishing or a fartleberry.
see 'excremished'

there are never really examples as they are not often spoken of, unless resulting in a follow through, one may be on the bus and be confronted by a fellow human being who will say something along these lines
"'psst. man I need help, you know that smell...well I though it was a fartle, but seems there was more to it than that...you don't 'appen to 'ave a spair pair of undies do you?"